York P3DHX12F08001 Manuale Utente

 
4 

Refer to Figure 1. Maintain clearances to 
combustibles as outlined in Table 1. The 
furnace may be suspended by field fabri-
cating a cradle of angle iron and 
threaded rod. Secure the furnace with 2 
inch minimum slotted angle or equiva-
lent, as shown in Figure 1. The furnace 
must be supported in such a way as to 
not allow twisting or sagging of the cabi-
net. Position the supports so as to not 
interfere with accessing the burner and 
blower compartments. Suggestion; as a 
measure to prevent fuel oil from accumu-
lating in locations other than the fire pot, 
as could be the case in the event of noz-
zle drip, install the furnace with an ap-
proximate 2 degree slope from the oil 
burner casing towards the fire pot. 
 

If the furnace is used in conjunction with 
air conditioning, the furnace shall be 
installed in parallel with or upstream from 
the evaporator coil to avoid condensation 
in the heat exchanger. In a parallel 
installation, the dampers or air controlling 
means must prevent chilled air from en-
tering the furnace. If the dampers are 
manually operated, there must be a 
means of control to prevent the operation 
of either system unless the dampers are 
in the full heat or full cool position. The 
air heated by the furnace shall not pass 
through a refrigeration unit unless the 
unit is specifically approved for such 
service. 

Generally, a six-inch clearance between 
the air conditioning evaporator coil and 
the heat exchanger will provide adequate 
airflow through the evaporator coil. 

The blower speed must be checked and 
adjusted to compensate for the pressure 
drop caused by the evaporator coil. Re-
fer to Appendix B for recommended wir-
ing and electrical connections of the air 
conditioning controls. 

When a furnace is installed in the full 
basement of a typical frame or brick 
house, infiltration is normally adequate to 
provide air for combustion and draft op-
eration. If the furnace is installed in a 
closet or utility room, two (2) ventilation 
openings must be provided connecting to 
a well ventilated space (full basement, 
living room or other room opening 
thereto, but not a bedroom or bathroom). 
One opening shall be located 6" from the 
top and bottom of the enclosure at the 
front of the furnace. For furnaces located 
in buildings of unusually tight construc-

tion, such as those with high quality 
weather stripping, caulking, windows and 
doors, or storm sashed windows, or 
where basement windows are well 
sealed, a permanent opening communi-
cating with a well ventilated attic or with 
the outdoors shall be provided, using a 
duct if necessary. Size all of the open-
ings and associated ductwork by the 
standards provided in the latest Oil In-
stallation Code editions; NFPA 31 in the 
United States, CAN/CSA B139 in Can-
ada. Take all fuel burning appliances in 
the area into consideration when calcu-
lating combustion and ventilation air re-
quirements. 

The Model CAS-2B-90E Furnace Boot 
manufactured by Field Controls, Inc. may 
be used with the furnace to obtain com-
bustion air directly from outdoors. Use of 
this device does not alter the need for 
ventilation air; however, it does provide a 
good direct source of combustion air and 
is connected directly to the oil burner. 

The chimney must be sized correctly and 
be in good repair. If the chimney is over-
sized, there is a high risk of the flue 
gases condensing resulting in damage to 
the chimney and other venting parts. 
This problem may be corrected by the 
use of an appropriately sized chimney 
liner. 

If the chimney serves the 
P3DHX12F08001 furnace only, the vent 
should be sized at 4-inch minimum, 5-
inch maximum. If the chimney serves the 
P2DHX16F12001 or P2LBX16F14501 
furnace only, the vent should be sized at 
4-inch minimum, 6-inch maximum. If the 
chimney serves the P4LBX20F19001 
furnace only, the vent should be sized at 
5-inch minimum, 7-inch maximum. The 
data provided in Table 3 is based on 
dedicated venting. If the furnace is to be 
co-vented with other appliances, refer to 
NFPA 211, Standard for Chimneys, Fire-
places, Vents, and Solid Fuel-Burning 
Appliances, 

NFPA 31, Standard for the 

or 

CAN/CSA B139, Installation Code For 
Oil Burning Equipment

 for correct sizing 

information. 

: The chimney must be 

capable of providing sufficient draft at all 
times for the safe removal of the prod-
ucts of combustion. 

The chimney should be tested under 
“winter” conditions; doors and windows 
closed, all other fossil fuel burning appli-
ances on, clothes dryer on, bathroom 
fans on, etc. If the chimney cannot over-
come the competition for air, it will be 
necessary to access the reason for it, 
and take corrective action. If the chimney 
is found to be sized correctly and in good 
repair, it will probably be necessary to re-
evaluate the availability of combustion 
and ventilation air, and take corrective 
action. 

The flue pipe should be as short as pos-
sible with horizontal pipes sloping up-
ward toward the chimney at a rate of 
one-quarter inch to the foot. The flue 
pipe should not be smaller in cross sec-
tional area than the flue collar on the 
furnace. The flue pipe may be reduced in 
size to fit a smaller diameter chimney 
with the use of a tapered reducer fitting 
at the chimney inlet. The flue pipe should 
connect to the chimney such that the flue 
pipe extends into, and terminates flush 
with the inside surface of the chimney 
liner. Seal the joint between the pipe and 
the lining. The chimney outlet should be 
at least two feet above the highest point 
of a peaked roof. All unused chimney 
openings should be closed. Chimneys 
must conform to local, provincial or state 
codes, or in the absence of local regula-
tions, to the requirements of the National 
Building Code. 

See Figure 2 and Table 2 for common 
chimney problems and their remedies. 
 

 

THE FURNACE MUST BE CON-
NECTED TO A FLUE HAVING SUFFI-
CIENT DRAFT AT ALL TIMES TO EN-
SURE SAFE AND PROPER OPERA-
TION OF THE APPLIANCE. 
 
The flue pipe must not be routed through 
concealed space, because it must be 
visually checked for signs of deteriora-
tion during the annual inspection and 
servicing. The flue pipe must not pass 
through any floor or ceiling, but may 
pass through a wall where suitable fire 
protection provisions have been in-
stalled. In the United States, refer to the 
latest edition of NFPA 31 for regulations 
governing the installation of oil burning 
equipment. In Canada, refer to the latest 
edition of CAN/CSA B139 for rules gov-
erning the installation of oil burning 
equipment.